PuTTY semi-bug sftp-slow

summary: PSFTP, and PSCP in SFTP mode, transfer files much slower than old-PSCP.class: semi-bug: This might or might not be a bug, depending on your precise definition of what a bug is.difficulty: tricky: Needs many tuits.priority: high: This should be fixed in the next release.fixed-in: 2003-09-30 150b6e0a87d399a31e22f3d4094017258060b96b (0.54)

We believe this is because the SFTP and SSH-2 protocols are less efficient at
bulk data transfer than SCP and SSH-1, because every block of data transferred
requires an acknowledgment from the far end. It would in theory be possible to
queue several blocks of data to get round this speed problem, but as yet we
haven't done the coding.

Update: As of the 2003-09-30 snapshot, performance should be
much improved. I believe there are tweaks that could be done to make
it better still, but I'm going to declare this closed anyway.